Infinitives

* Some verbs are followed by (OBJECT) + TO + INFINITIVE

Advise, allow, afford, agree, arrange, ask, decide, expect, forget, help, hope, invite, learn, manage, prefer, promise, refuse, regret, seem, teach, tell, want.

The doctor advised her to stay at home
She decided to go to the party
I forgot to phone her.
They asked him to wait for a few minutes.
He seems to be a pleasant man.
I want to teach him to read.
He decided not to wait.

* Some adjectives are followed by TO + INFINITIVE

Able, afraid, angry, delighted, difficult, disappointed, easy, glad, happy, impossible, possible, sad, sorry, supposed, surprised.

They are delighted to see each other again.
You are supposed to come here at 8:00.
She was surprised to see her old friend.
It’s not possible to play football today.

* HOW TO + INFINITIVE

I don’t know how to explain the problem.
Can you tell me how to get to the cinema?
She taught me how to ride a bike.

* INFINITIVE OF PURPOSE.
To express purpose we can use to-infinitive.

She went to the supermarket to buy some meat.
He phoned Mary to tell her that she was ill.

* TOO / ENOUGH + INFINITIVE

She is too tired to go out.
The box is too heavy for one person to carry.
He is old enough to see the film.
It isn’t warm enough to swim in the lake.

* After some nouns or pronouns such us something, nothing, somewhere, etc. we use TO + INFINITIVE.

There is nothing to do there.
I’ve bought some meat to cook for lunch.
She had to find somewhere to live.